Silver Gallium Sulfide (AgGaS₂ or AGS)
Silver Gallium Sulfide (AgGaS₂ or AGS), is transparent over the range 0.53 to 12µm and has proven to be an effective as a material to frequency doubling in the the infrared.

AgGaS₂ / AGS strengths include:
  • High non-linear coefficient
  • High damage threshold
  • Wide transmission range
  • Low optical absorption
  • Low wavefront distortion

AgGaS₂ / AGS applications include:
  • SHG using CO and CO₂ Lasers
  • Frequency mixing in the IR using Laser Diode, Ti:Sapphire, Nd:YAG and Dye Laser sources
  • OPO using Nd:YAG pump
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AgGaS2 Crystal - Availability
  • Format:
Rods, Discs and Slabs
  • Sizes:
Diameter: TBAmm max and Length: TBAmm max
AgGaS2 Crystal Properties
Laser / Optical Properties Units Value
Transmission/Transparency Range µm 0.47 - 12
Refractive Index (n) @1.06µm n₀ = 2.4508
ne = 1.3966
@5.3µm n₀ = 2.5823
ne = 2.3421
@10.6µm n₀ = 2.5915
ne = 2.5915
Non-linear Coefficient @10.6µm (d36) pm/V 12.5
Walk Off @5.3µm º 0.85
Absorption Coefficient @1.06µm cm‾¹ <0.02
@2.5µm cm‾¹ 0.01
@5.0µm cm‾¹ 0.01
@7.5µm cm‾¹ 0.02
@10.0µm cm‾¹ <0.6
Physical / Thermal Properties Units Value
Chemical Formula AgGaS₂
Melting Point ºC 998
Thermal Expansion Coeff. @20ºC 10‾⁶/ºC ┴ 12.5
║ -13.2
Thermal Conductivity Coeff. @20ºC W/m/ºK TBA
Specific Heat J/g K TBA
Density g/cm³ 4.56
Mohs Hardness 3 - 3.5
Optical Damage Threshold @10.6/ºC,150ns MW/cm² 10 - 20